Shaker-screen



M. OTTO.

SHAKER SCREEN.

APPLICATION FILED FEB-24,1919.

- Patented Nov. 9, 1920.

3 SHEETS-SHEET l.

M. OTTO.

SHAKER SCREEN.

APPLICATION FILED FEB. 24, 1919.

Patented Nov. 9, 1920.

3 SHEETS-SHEET Z.

b'fllllllil Zzvanor Jfcm. Oifo M. OTTO.

SHAKER SCREEN.

APPLlCATlON FILED FEB. 24. 1919.

1,358,103. Patented Nov. 9, 1920.

3 SHEETS-SHEET 3.

m v W UNITEDSTATES PATENT OFF ICE.

MATT OTTO, OF CAREY, OHIO, ASSIGNOR TO THE NATIONAL LIME & STONE CO., 01CAREY, OHIO, A CORPORATION OF OHIO.

SHAKER-SCREEN.

Specification of Letters Patent.

Patented Nov. 9, 1920.

Application filed February 24, 1919. Serial No. 278,574.

To all whom it may concern Be it known that I, MATT O'r'ro, a citizen ofthe United States, residin at Carey, in the county of Wyandot and tateof Ohio have invented a certain new and useful Improvement inShaker-Screens, of which the following is a specification.

My invention relates to improvements in shaker screens such as may beused for screening limestone, coal, sand or any other comminuted orfragmentary materials. It has for one object to provide a new andimproved form of self-balancing screen which may be used in any kind ofa building without undue vibration. Another object is to provide alight, high speed, large capacity screen which will pass materialthrough it with a minimum of power loss and with a maximum of speed.Other objects will appear from time to time in the specification.

My invention is illustrated more or less diagrammatically in theaccompanying drawings, wherein- Figure 1 is a plan view;

Fig. 2 is a side elevation;

Fig. 3 is a section along line 33 of Fig. 2;

Fig. 4c is a detailed elevation of a modi fled form;

Fig. 5 is a section along the line 5-5 of Fig. 4;

Fig. 6 is a side elevation of a modified form.

Like parts are indicated by like characters in all the figures.

A is a solid durable base frame or bed made up of a series of separatebeams or girders and adapted to be put in place in any structure or onany support or foundation in the usual manner. Upon it this base framecarries pillow blocks A A in which is rotatably mounted a shaft A uponwhich is a pulley A adapted to be driven from any suitable source ofpower. At either end of the shaft A are eccentrics A A driving straps AA and eccentric rods A A. These eccentrics are spaced 180 degrees onefrom the other.

Erected upon the base frame A is an upwardly extending shaker frame B,made up of horizontal and vertical beams bolted or otherwise fastenedtogether. B is a coarse screen mounted for reciprocation on the links Bdownwardly depending from the further frame B. These links are mountedon the shafts 13 in bearing blocks B and are outside of the frame B andsupport by means of bearings as shown the screen shafts B which extendoutwardly beyond the frame and support the coarse screen B by means ofsaddle clips B. The connecting rods A are pivoted on one of said shaftsB so that as the eccentric driving shaft rotates and carries theeccentric with it the upper coarse screen will be reciprocated.

It will be noted that the upper coarse screen is located between thecross pieces of the upper frame but that the hangers or links upon whichit is swung are located on the outside, thus the whole assembly takes upa minimum of room and all the moving parts-are easily gotten at foradjustment, change and repair.

C is a lower screen frame mounted within the supporting housing orframework and supported on the upwardly extending links C C which arepivoted on shafts C C extending through the pillow blocks C C on theframe work A. The eccentric rods A A engage one of the shafts C so thatas the eccentric shaft rotates the screen will be reciprocated. It willbe noted that since the two eccentrics are separated by an angle of 180degrees the two screens will reciprocate in opposite directions andthere will thus be a very large degree of balance between them. C is achute which discharges material from any suitable source onto the screenB adjacent one end. As the screen reciprocates the material passes downtoward the left, the fine particles falling through, the coarseparticles going on until they are discharged over the end of the screenonto a chute C. The particles which fall through the screen B are caughton the screen C somewhere along its length and pass on with those thatare too coarse to pass through until they are discharged into the chuteG The lines which go through are caught in the hogper C. You Wlll noticethat this hopper 8 extends through the entire length of the screen C sothat the material no matter where discharged is caught in the hopper. Itwill also be noted that the screen B is above the screen 0 forsubstantially its entire length so that anything that is dischargedthrough the screen 131 will be caught by the screen C and-thus all marotation on the shaft (1*:

ing direction and in order to assist in the smooth, runnin balance ofthe device, I have tied up t e two reciprocating screens by spring tiemembers WhlCh tend to exert at all times a yieldingv pull onthe screensnormally turning them to their central po-- sition and resisting theirmovement away from the central position in both directions. Thesesprings are so arranged that the farther the screen moves in theopposite direction, because they always move toward or from one anotherand never in the same 'di rection, the harder be the pull of the springand to assist in reducing vibration and balancing the screen.

I have shown these balancing springs in several forms, the first form,consists in two open springs arranged in a pair and while probablycheaper I am inclined to prefer the other form l ecause of its greaterdurability and accuracy. I have described first, however, the form shownin Figs. 2 and 3. i I f D D are yokes pivoted on the shaft B C. Theseyokes extend across ;and terminate in arms through which pass loops D Dthere being one loop on either side ofeach shaft B C. Coil tensionsprings D are attached to the loops D D l being so positioned that whenthe two screens are in the central position there isistillk aconsiderable tension upon these springs. The springs being of the samestrength balance each other and hold the yoke substantially parallel. I)is a pipe or rod extending downwardly from one of the yokes D inslid-able engagement with a pipe or rod D extending upwardly from theother yoke D. A grease cup D on the rods D co unicates with the interiorthereof and w'th the exterior of the rod D whereby grea may be movedunder pressure to lubricate lzlloth of the yokes D=where they ride uponthe shaft D C. There will be a sliding movement of these two tubes orrods one upon the other as the screens move back. and forth, and thesetwo rods tend to assistthe spring yoke couples in holding the partstogether and to prevent looseness and play.

Referring now to the form shown in Figs. 4: and 5, E is a yoke mountedon the eililft B Downwardly extending from his yoke is a cylindrical lugE in which is rretvthreaded the piston rod E carrying at its end apiston E havingan enlarged. annular head E. E is a yoke mounted for Itis provided with an upwardly extending screw-threaded collar E in whichis screw-threaded a cylindrical housing E terminating at its upper endin a screw-threaded apertured cap E The aperture in this cap is inslidable ,in the supporting frame.

engagement with'the lug E. E is a compression spring contained withinthe housmg E" and adapted to be compressed between the cap 8 and theflange E, the flange E being also in slidable engagement with thehousingE". This housing provides a grease container in which the springreciprocates. The grease, of course, keeps the spring in propercondition as well as the bearing surfaces between the flange E and thehousing E and between the walls of the aperture of the cap E and the lugE In Fig. 6 I have shown a modified form in which the driving shaft islocated with- In this form I have shown the further modification of thespring suspension in that the springs D there shown are simply coilsprings pinned to the screens. i

It ispossible to substitute in either form of my invention, a crankshaft and connecting rods in place of the eccentric.

It will be evident that while I have shown in my drawings an operativedevice, still many changes might be made in size, shape and arrangementof parts without departing materially from the spirit of my inventionand I wish, therefore, that my grammatic.

The use and operation of my invention are as follows When power isapplied to the main drive shaft and it rotates, the two eccentrics willrotate with it. Since they are separated by an angle of 180 degrees andsince they are connected by links one to each of the reciprocatingscreens, it will be evident that these screens will work back and forththeir movement beingseparated by an angle of 180 degrees that is, theywill be moving in opposite directions at all times, and when the upperone is at the right hand limit of its excursion the lower one will be atthe left hand limit of its excursion and vice versa. Since the linksupon which these screens are mounted are of the same length and sincethe relation between the screens and the links is such that the drive ofthe eccentric tends to throw the screens up owing to its eccentricityand allow them to drop down projecting the material forward there willbe a constant travel of the material along each screen from the righthand toward the left hand end but since these screens are comparativelyheavy the strain on the driving mechanism caused by changing theirdirection and their speed of movement will be considerable and I haveprovided, therefore, yielding means which tend to return each screen tothe neutral or central position. This yielding means takes the form of aspring or elastic member which tends to pull the two links of each pairinto parallelism or into the position which they would occupy drawingsbe regarded as in a sense diawhen the screens are in their central orneutral positions, and of course, since the screens move in oppositedirections, the tension on the spring will be. greatly increased towardthe end of the stroke and thus the springstored energy in the springwill be sufiicient largely to cause the return movement and thus togreatly assist the power mechanism in overcoming inertia. of thescreens.

The preferred form indicated in Figs. 4 and 5 provides an inclosedproperly lubricated spring. The housing being a telescoping housingpermits free movement of the parts and compression and expansion of thespring at all times and the association of the two screens moving inopposite directions with their respective springs is such that the Wholedevice may be a self-contained, selfbalanced, screen structure Iclaim 1. A screening machine comprising two reciprocating screens oneabove the other, means for reciprocating them in unison in oppositedirections and yielding means interposed between the two screens andlying wholly within said machine for resisting their movement away fromthe central position said yielding means comprising coil springsattached adjacent the opposite ends of the screens.

2. A screening machine comprising two reciprocating screens arranged oneabove the other, rocker arms upon which the screens are mounted, thearms for the upper screen downwardly depending below their pivot points,for the lower screen upwardly extending above their pivot points andmeans applied to the ends of said rocker arms for reciprocating thescreens in opposite direc-' tions, yielding means interposed between thescreen ends of the rocker arms on the two screens for resisting movementof the screens away from their central position.

3. A screening machine comprising two reciprocating screens arranged oneabove the other, rocker arms upon which the screens are mounted, thearms for the upper screen downwardly depending below their pivot points,for the lower screen upwardly extending above their pivot and yieldingmeans applied to the screens comprising a spring arrangement adapted toresist separation of the screen ends of the supporting rocker arms ofthe two screens.

4. A screening machine comprising two reciprocating screens one abovethe other, means for reciprocating them in unison in oppositedirections, shafts attached to each of said screens, sleeves mounted onsaid shafts, a cylindrical lug projecting from one, a cylindricalhousing from the other, a sliding connection between the lug and thehousing, a plunger projecting outwardly from the lug and engaging thehousing adjacent its supporting sleeve and a spring interposed betweenthe outer end of the housing and the plunger to resist separation of lugand housin 5. A screening machine comprising two reciprocating screenplates, links upon which .they are supported, an eccentric driving shaftfor the screens and eccentric rods ex tending therefrom to the screens,the links supporting the upper screen extending downwardly toward itthus supporting it, the lower links extending upwardly toward the screenand supporting the lower screen, the eccentrics on the shaft which drivethe eccentric rods being separated by an angle of 180, yielding meanstying together the screen ends of the links of the two screens andadapted to resist movement of the screens away from their centralposition.

6. The combination with two reciprocating screens superimposed one abovethe other of means for moving them in opposite directions in unison andyielding means interposed between the screens adapted to progressivelyand increasingly resist the movement of the two screens away from theircentral positions.

7. A screening machine comprising two parallel reciprocating screenssuperimposed one above the other, means for moving them in oppositedirections in unison, said means lying substantially within thescreening machine and yielding means interposed between the screensadapted progressively and increasingly to resist the movement of the twoscreens away from their central positions.

8. A screening machine comprising two reciprocating screen plates, aframe in which they are supported by links, an eccentric driving shaftfor said screens located within said frame and eccentric rods extendingfrom the shaft to the screens, the links supporting the upper screen,extending downwardly toward it thus supporting it, the lower linksextending upwardly and supporting the lower screen, the eccentrics onthe shaft which drive the eccentric rods being separated by an angle of180, yielding means tying together the screen ends of the links of thetwo screens, and adapted to resist movement of the screens away fromtheir central position.

9. A screening machine comprising a supporting frame, two horizontalscreens, one above the other mounted in it by rocker arms and a yieldingconnection between the said screens, means oscillating them in unison inopposite direction, situated within the frame and comprising aneccentric shaft and eccentric rods connected to the screens.

10. A screening machine comprising a supporting f'ame, two horizontalscreens, one above the other, supported in it by rocker arms, meanslying within the frame for oscillating them in unison in oppositedirection and yielding tension exerting action between them, adapted toresist said oscillatory motion.

11. A screening machine, comprising a 1 frame, two screens Within saidframe, one

5 superimposed above the other, the lower screen supported from below,and the upper screen supported from above, means located Within saidframe for oscillating said screens in unison in opposite directions, andyield- 10 ing means lying substantially Within said frame, connectingsaid screens, and adapted progressively, and increasingly to resist saidoscillatory motion. In testimony whereof I affix my signature in thepresence of two witnesses this first 15 day of February, 1919.

MATT OTTO.

Witnesses: I

R. G. SPENCER, FRANK J. KELLY.

